Powertrain, generic (extended)

P2150 Fuel Injector Group B Supply Voltage Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2150 reports the common feed of injector group B shorted toward ground. In GM's 2018 Duramax tables group 2 holds injectors 2 and 3 on the 2.8 L four-cylinder but injectors 2 and 5 on the 6.6 L V8; the test is the same as for group A – 0.5 Ω or less to ground with the driver on, 5 failed samples out of 10, type A with lamp on the first trip. Ford's 2023 diesels flag a short of group B to ground or battery, detected by the driver chip in roughly 0.2 s. GM petrol direct injection, documented for the Saab 9-5 2.0T, uses P2150 for low voltage on the high-side control line of cylinder 2. Because both injectors of a diesel bank lose their feed, the engine runs on fewer cylinders. P2149 is the open circuit, P2151 the high fault of this group.

Likely causes

Group B supply wire chafed and shorted to ground
Injector of group B shorted to its body
Moisture in the injector harness connector
Faulty injector driver in the engine control module

Symptoms

  • Two cylinders misfire together
  • Marked power loss and vibration
  • Check engine lamp on immediately

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injectorinjector wiringengine control module

Related codes

P2149P2151P2147P2153P0264

References: gsi.ext.gm.com, fordservicecontent.com, saabwisonline.com.